52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtldr/modules/framebuf/gop.c
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* DESCRIPTION: Graphical Output Protocol (GOP) support
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <framebuf.h>
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/**
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* Returns a number of bits per pixel (BPP) in the current video mode.
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*
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* @return A number of bits per pixel.
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*
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* @since XT 1.0
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*/
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XTCDECL
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UINT32
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GoppGetBitsPerPixel()
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{
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UINT32 BitsPerPixel, CompoundMask;
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switch(FrameBufferInfo.Adapter.GOP->Mode->Info->PixelFormat)
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{
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case PixelBlueGreenRedReserved8BitPerColor:
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case PixelRedGreenBlueReserved8BitPerColor:
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case PixelBltOnly:
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BitsPerPixel = 32;
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break;
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case PixelBitMask:
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BitsPerPixel = 32;
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CompoundMask = FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.RedMask |
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FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.GreenMask |
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FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.BlueMask |
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FrameBufferInfo.Adapter.GOP->Mode->Info->PixelInformation.ReservedMask;
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while((CompoundMask & (1 << 31)) == 0)
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{
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BitsPerPixel--;
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CompoundMask <<= 1;
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}
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break;
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default:
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BitsPerPixel = 0;
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break;
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}
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/* Return bpp */
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return BitsPerPixel;
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}
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